Expansion-bolt.



i D. MASOR. EXPANSION BOLT. APPLIoATIoN FILED lanas, 1912.

1,066,5 1 2. Patented July 8, 1913.

DANIEL MASOR, 0F NEW` YORK, N. Y.

EXPANSION-BOLT.

Specification of Letters Patent.

Patented July S, 1913.

Application filed December 3, 1912. Serial No. 734,749.

To all whom 1' t may con/cera Be :it known that I, DANIEL Mason, a citizen of the United States, residing at New York city, in the county of New York and State of New York, have invented new and useful Improvements in` lilxpansion- Bolts, ot which the following is a specification.

This invention relates to expansion bolts and has for its object to provide a compari tively simple and inexpensive device o'li this character, with but t'ew parts and which,

wh-en assembled together, will not become` separated and lostidu ring shipment.

To these ends the invention consists in the novel details of construction and combination of parts more fully hereinafter de scribed and particularly pointed out in the claims.

Referring to the accompanying drawings forming a part ot this specilication in which like numerals designate like parts in all the views Figure 1 is a sectional view ot' a wall and showing my improved boltst cured in position thereon. Fig. 2 is across sectional view of the bolttaken` on the line 2 2 of Fig. 1. Fig. 3 is a cross sectional view of the bolt taken on the line 3 3 ot' Fig. 1. F ig. 1 is a view showing the bolt removed from the ywall and in` its contracted position. Fig. 5 is a view showing a moditied; form ot my improved bolt. Fig. is a view showing' another modification of the pivotedend of the bolt. Fig. 7 is a view showing a still further modification of the pivoted end of the bolt. i

My improved bolt is intended for securing objects to stone, ceramic or similar types ot walls where the ordinary bolt is unfit t'or accomplishing this purpose.

In Fig. 1 the stone or ceramic wall o is shown provided with a hole in which is secured my improved expansion bolt c for securing to the tace of a wall a portion of an object (l. The bolt comprises a pair of opposed jaw members 1 and 2 provided with the inner hollow portions 3 which taper ott at their bottom as indicated at 4. At the top portion of the jaw member 2 and on each side thereof, are formed circular' and countersnnk projections 5 in which are held a pivot pin` ti. lfrojecting hooks 7 formed on the top portion of the jaw member 1, are mounted within the countersunk projections 5 and are arranged around the pivot pins G.

Locking pins S mounted within the countersunk portions oil. the jaw member 2 contact with the outer edges t) ot' the hooks 7 and prevent the accidental opening ot the jaws until the bolt is operated. Through the jaw members is inserted a screw threaded bolt 10 provided at its upper end with the usual head 11 and secured to its lower or screw threaded end, is a tapering nut 12 which is provided with a pair ot' opposed and radially extending lugs These lugs are adapted to operate withinthe openings 111 formed by the tapering edges 15 in the'sides o't the jaw` members 1 and 2. Projecting lugs 16 formed on the lower portions ot one 'ot the -pivoted jaw members and arranged for contacting with the cut away portions 16 oit the opposite jaw member, are provided :tor contacting with `the lugs 13, oit' the tapering nut and preventing the same from becoming detached from the pivoted jaw members during shipment. Straight bevelett portions 17 are also provided on the sides oi the nut 12 for slidably contacting'- with the straight portions 18 on the inside oit' the pivoted jaw members for preventing the jaw members and tapering nut from` turning when the head ot the threaded bolt is operated.`

It is to be noted that both of the expanding jaw members are roughcned and bowed on their outer .surfaces which permits of a uniftform contact with the wall of thedrilled hole when theyare secured to position. The outer surtaces ot' the jaw members are also provided with the straight butroughened sideportions 19 which prevent the jaw mem` bers 'from turning within the drilled hole when the bolt is operated.

A collar 2O formed on the upperrmls of the exjfianding jaws strengthens that pivoted portion ot the bolt and turther assists in `forming a neat and flush joint at the union of the bolt and `drilled hole at their' exposed ends.

In the modification shown in Fig. 5 both the projecting and hook portions 2O and 21 ott the jaw members, are shown ot' diti'erent shape and thc hook portion` 21 is provided with an openinol 22 through which the pivot pin 23 projects. A second pin 21 is arranged Jfor contacting with the inner side of the hook 21 and thereby preventing the accidental opening of the jaw members until the bolt is operated. The lugs 25 and 2G, mounted on the lower ends of the pivoted jaw members, and which contact with the lugs mounted on the tapering nut, are formed to j with and the projections 30 on one of the jaw members fit and are held within the countersunk portions 3l of the opposite jaw member.

In manufacturing, the jaw members are preferably cast of malleable iron and when assembled together the hook portions of one of the members are sprung outward over the circular projections and pivot pins and into place within the countersunk portions of the other jaw member, the tapering nut of course, being first placed between the jaw members before they are pivotally connected together. After the jaw members have been connected together the locking pins are then secured into position so that they contact with the outer edge or bulged portion of the hooks, thereby securely holding the pivoted jaw members in their closed or contracted position.

In use the contracted jaw members holding the tapering nut are first placed within the hole formed in the wall. rIhe threaded bolt is then inserted through a hole formed in the object to be secured to the wall and into the jaw members and then screwed into the tapering nut. The further turning of the bolt head causes the nut to feed along the screw threaded portion of the bolt and the tapering side portions of the nut to slidably engage with the inner lower tapering portions of the jaw members and cause the jaw members to expand and securely grip the walls of the hole. During the expansion of the jaw members, due to the pressure exerted in turning the bolt head, the outer edges of the hooks that engage with the locking pins become crushed, due to their softness, thereby permitting the expansion of the jaw members when secured to position within the hole of a wall.

Heretofore, expansion bolts have not been securely bound together to prevent the parts from becoming separated and lost during transportation and furthermore lag screws have also been employed, which as is welllmown, have no standard thread and on this account it has sometimes proven diiiicult to successfully operate the expanding jaws. By the use of a deviceconstructed in accordance with this invention it will be seen that I overcome these diflioulties and have provided an expansion bolt with pivoted jaw members that cannot become separated and furthermore, that also I have provided a standard bolt and nut for successfully operating the expanding jaw at all times.

It is obvious that those skilled in the art may vary the details of construction and arrangements of parts withoutV departing from the spirit of my invention and therefore I do not wish to be limited to such features except as may be required by the claims.

That is claimed as new is l. In an expansion bolt, thecombination of a pair of pivoted jaw members provided with bowed and roughened outer surfaces, a threaded bolt .passing through the jaw members, a tapering nut mounted on the said bolt and adapted to contact with the pivoted jaw members and arranged for expanding the'said jaw members upon the turning of the bolt, said jaw members provided with coacting and interlocking means adapted to prevent the expansion of the jaw members until the threaded bolt is operated. Y

2. In an expansion bolt, the combination of a pair of pivoted jaw members provided` with bowed and roughened outer surfaces, a

threaded bolt passing through the jaw members, a tapering nut mounted on the threaded bolt, a locking pin mounted on the pivoted ends of the jaw members, projections mounted on the jaw members and adapted for coacting with the locking pins for holding the pivoted jaw members in the closed position until the turning of the bolt, and a projecting lug mounted on the lower end of one of the jaw members and arranged fo-r contacting with the tapering nut for the purpose set forth.

3. In an expansion bolt, the combination of a pair of pivoted jaw members provided with bowed and roughened outer surfaces, a threaded bolt passing through the v jaw members, said jaw members provided with countersunk portions, a locking pin mounted in the countersunk portions, hooks mounted in the countersunk portions for coacting with the projecting lugs for preventing the expansion of the aw members until the threaded bolt is operated, a tapering nut mounted on thethreaded bolt, and lugs mounted on the tapering nut and arranged for contacting with the projecting lug on the aw member, for the purpose set forth.

4. In an expansion bolt, the combinationI of opposed jaw members provided with roughened and bowed outer surfaces, one of said jaw members is also provided at its upper end with a circular countersunk projection, a pivot pin mounted on the circular projection, a projecting hook mounted on the upper 'end of the other jaw member and adapted to fit within the circular countersunk portion and extend around the pivot pin, a locking pin mounted within the countersunk portion and adapted to engage nut for contacting with the jaw members with the projecting hook for holding the for the purpose set forth. l0 jaw members in their contracted position, it In testimony whereof I affix my signature threaded holt passing through the jaw in presence of two witnesses.

members, a, tapering nut mounted on the DANIEL MASOR. threaded bolt :ind arranged :for expanding XVitnesses:

the jaw members upon the turning of the Griso. A. BYRNM,

bolt, and means mounted on the tapering M. E. ImUonLrN.

Copies of this patent may be obtained for ve cents each, by addressing the Commissioner of Patents, Washington, D. C. 

